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CBSE Questions for Class 11 Engineering Physics Physical World Quiz 4 - MCQExams.com
CBSE
Class 11 Engineering Physics
Physical World
Quiz 4
Which of the following instruments is used to check whether electricity is flowing through a substance or not?
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Ammeter
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Voltmeter
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Tester
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None of these
Explanation
Tester is used to check whether electricity is flowing through a substance or not.
Which of the following is/are the source/s of ultraviolet radiations?
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The sun
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Electric arcs of mercury
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Discharges in hydrogen
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All of these
Explanation
$$\begin{array}{l}\text { Natural source of UV radiation is Sun. } \\\text { Where as artificial Sources are Black (lights, short wave }\end{array}$$
$$\begin{array}{l}\text { UV lamps, Electric arc's, gas discharges, uv lasers, } \\\text { UV LEDS etc. }\end{array}$$
A flat-bottomed test-tube with some lead shots in it floats upto a depth of 3.2 cm in a liquid and 2.4 cm in water. Find the relative density of the liquid.
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0.24
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0.75
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0.1
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0.5
Explanation
$$\begin{array}{l}\text { Mass of liq displaced = Volume displaced} \times \text{density of liquid } \\\text { mass of water displaced = } A \times 2.4 \times d_{1} \\\text { Mass of (liquid displaced }=A \times 3.2 \times d_{2}\end{array} $$
$$\begin{array}{l}\text { mass of water and liquid displaced are equal } \\\qquad A\times 2 \cdot \varphi d_{1}=A \times 3\cdot 2 d_{2}\end{array}$$
$$\begin{array}{l}\quad \dfrac{d_{2}}{d_{1}}=\dfrac{2.4}{3.2}=0.75 \\\text { Relative densety of }\text { liquid }=0.75\end{array}$$
The light from the sun takes $$400$$ s to reach the earth. Assuming that the speed of the light is $$2,00,000 km/s$$, calculate the distance between the sun and the earth-
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$$800$$ million km
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$$80$$ million km
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$$100$$ million km
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$$120$$ million km
Explanation
Given data:
Time taken by light to reach at earth $$=400s$$
speed of light $$=200000km/s$$
To find distance between sun and earth $$=?$$
$$Distance= speed\times time$$
$$=200000\times 400$$
$$=80\times 10^6Km$$
$$=80 \ million \ km$$
Which of the following is a contact force ?
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Gravitational force
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Friction
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Electrostatic force
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Magnetic force
Explanation
Frictional forces arise when two bodies come in contact with each other (b).
A charged comb picks up bits of paper because of :
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magnetic force
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gravitational force
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contact force
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electrostatic force
Explanation
A charged comb attracts the electrons in the bits of paper through electrostatic force.(d)
The electric generator is based on which scientific principle?
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Reflection of ultrasonic waves
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Superconductivity
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Faradays laws of electromagnetic induction
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Magnetic confinement of plasma
Explanation
Electric generator was faradays law of electromagnetic induction,a changing magnetic flux gives rise to electric current.
No contact force acts on a bucket when it is being pulled out of a well using a rope
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True
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False
Explanation
When the bucket is pulled out of a well using a rope,the tension of the rope pulls the bucket up which is a contact force.(b)
What was the major contribution/discoveries of Archimedes?
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Principle of buoyancy; Principle of the lever
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Wave theory of light
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Laws of electromagnetic induction
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Generation of electromagnetic waves
Explanation
Archimedes discovered the principal of buoyancy when he was taking a both observed watts getting displaced when he got into the both tub.He also discovered the principle of the lever.(a)
Werner
Heisenberg is known for his work on
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Inelastic scattering of light by molecules
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Quantum mechanics: Uncertainty principle
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Theory of super conductivity
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Expanding universe
Explanation
Answer is B
In quantum mechanics, the uncertainty principle, also known as Heisenberg's uncertainty principle, is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position and momentum, cannot be known simultaneously.
The Steam engine is based on which scientific principle?
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Faradays laws of electromagnetic induction
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Laws of thermodynamics
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Ampere's Law
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Total internal reflection of light
Explanation
The steam engine is based on the zeroth,first and second laws of thermodynamics.
The magnitude of non-contact force depends upon:
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distance between two bodies
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area of contact
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both of them
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none of the above
Explanation
Non-contact forces like gravitation and electromagnetic forces depend on the distance between the two bodies.(a)
The volume of a single liquid drop can be measured using a :
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measuring jar
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measuring flask
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pipette
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burette
Explanation
$$\begin{array}{l}\text { We can use a laboraty burette to find volume of a single } \\\text { drop. The burette has marking in } m \text { l and } P S \text { used to find } \\\text { the volume change. }\end{array}$$
Bose-Einstein condensate is based on which scientific principle?
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Magnetic confinement of plasma
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Trapping and cooling of atoms by laser beams and magnetic fields
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Wave nature of electrons
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Motion of charged particles in electromagnetic fields
Explanation
Bose-Einstein condensate is made by trapping and cooling of atoms by laser beams and magnetic fields.
Identify the following force:
1)Force between the charged particles.
2)Attractive for unlike charges and repulsive for like charges.
3)It does not need any intervening medium.
4) It is not the strongest force.
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Gravitational Force
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Electromagnetic force
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Strong nuclear force
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Weak nuclear force
Explanation
Electromagnetic force requires charged particles.It is attractive for unlike charges and repulsive for like charges.It can travel through vacuum also and it is the second strongest force.
Which force is strongest of all fundamental forces?
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Weak nuclear force
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Strong nuclear force
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Electromagnetic force
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Gravitational force
Explanation
The strong nuclear force is the strongest of all fundamental forces.
Whereas Gravitational force is the weakest of all fundamental forces.
Electron microscope is based on which scientific principle?
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Light amplification by stimulated emission of radiation
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Wave nature of electrons
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Digital logic
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Reflection of ultrasonic waves
Explanation
Electron microscope is based on the principle
of De-Broglie hypothesis of wave-nature of electrons.
Which of the following does not comes under microscopic forces?
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Normal force
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Tension force
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Frictional force
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All of these
Explanation
Normal force,tension force and Frictional force,all are macroscopic forces.
Oersted and Faraday unified which of the following achievements?
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Electric and magnetic phenomena
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Electromagnetism and optics
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Electro-weak forces
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Terrestrial and celestial
Explanation
Electric and magnetic was explained by Oersted and Faraday in 1820.
Which of the following forces have the infinite range?
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Weak nuclear and Strong nuclear force
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Electromagnetic and Strong nuclear force
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Gravitational and Electromagnetic force
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Gravitational and Weak nuclear force
Heliocentric theory was proposed by ................
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Copernicus
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Ptolemy
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Newton
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Tychobrahe
Explanation
Heliocentric theory is an astronomical model which was proposed by
Polish astronomer
Nicolaus Copernicus. In this theory, the sun is at the center of the solar system and all the planets and heavenly bodies revolve around it.
State whether given statement is True or False.
Science is Classified into various branches like physics, chemistry, biology, medical science, agriculture science ?
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True
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False
Explanation
Science is Classified into various branches like physics, chemistry, biology, medical science, agriculture science-
True
Name the Indian scientist who has contributed in the discovery of inelastic scattering of light by molecules.
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C.V. Raman
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M.N. Saha
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S.N. Bose
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None of the above
Explanation
C.V. Raman is the Indian scientist who has contributed in the discovery of inelastic scattering of light by molecules.
Rishi chakra was a famous ancient scholar in the field of ?
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Ayurvedic medicine
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Homeopathy
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Alopathy
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chemistry
Explanation
Rishi chakra was a famous ancient scholar in the field of Ayurvedic medicine.
Stars appears to move from east to west because
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all stars move from east to west
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the earth rotates from west to east
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the earth rotates from east to west
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the background of the stars moves from west to east
Explanation
it is relative motion, we are moving with earth which is rotating and we see starts going from east to west then earth must be rotating
from west to east.
so best possible answer is B.
Which of the following scientific phenomenon is involved in the generation of Hydroelectric power?
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Motion of charged particles in electromagnetic fields
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Conversion of gravitational potential energy into electrical energy
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Bernoullis principle in fluid dynamics
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Trapping and cooling of atoms by laser beams and magnetic fields.
Explanation
In dams,the gravitational potential energy of water is used to turn the turbines which generate electrical energy.
The Giant Metrewave Radio Telescope (GMRT) is related to _________________.
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Superconductivity
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Generation, propagation and detection of electromagnetic waves
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Detection of cosmic radio waves
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Trapping and cooling of atoms by laser beams and magnetic fields
Explanation
The Giant Metrewave Radio Telescope (GMRT) is related to Detection of cosmic radio waves.
Raghu learnt something in school and he told his friends "An object can appear smaller or bigger in size depending on its distance from you. So, an elephant can look as small as
a cat if it is far away."
Based on this, his friends said the following:
Kabir: "All stars are of the same size."
Raina: "All other stars are definitely smaller than the Sun."
Karen: "The Sun and the Moon are definitely of the same size.
"
Shifa: "There could be a star which is bigger than the Moon."
Who is correct?
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Only Shifa.
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Only Raina.
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Only Kabir and Karen.
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Only Kabir and Raina.
Explanation
$$\begin{array}{l}\text { Raghu learnt that object size depends on the distance } \\\text { from viewer. } \\\text { 1) Kabir: - He Said all star's are of same size. } \\\text { Statement is false as different star's are at different }\end{array}$$
$$\begin{array}{l}\text { distances we cannot compare. } \\\text { Raina, karen are also false because of Same reason. } \\\text { So Only Shifa is Correct. }\end{array}$$
Which of the following is used in field of medical ?
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CT Scan
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X ray
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ECG
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All of above
Explanation
CT Scan,
X ray,
ECG are
used in field of medical.
CD, DVD , Television are invention of science related to which field ?
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Banking
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Defence
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Entertainment
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Agriculture
Explanation
CD, DVD , Television are invention of science related to Entertainment field.
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